| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2015 | Q2 | 659,931 | -54,780 |
| 2015 | Q1 | 714,711 | +66,685 |
| 2014 | Q4 | 648,026 | +7,907 |
| 2014 | Q3 | 640,119 | +10,762 |
| 2014 | Q2 | 629,357 | +22,155 |
| 2014 | Q1 | 607,202 | -147,073 |
| 2013 | Q4 | 754,275 | -58,284 |
| 2013 | Q3 | 812,559 | +23,394 |
| 2013 | Q2 | 789,165 | -46,387 |
| 2013 | Q1 | 835,552 | +13,980 |
| 2012 | Q4 | 821,572 | +162,577 |
| 2012 | Q3 | 658,995 | -324,095 |
| 2012 | Q2 | 983,090 | +220,615 |
| 2012 | Q1 | 762,475 | -114,592 |
| 2011 | Q4 | 877,067 | +6,198 |
| 2011 | Q3 | 870,869 | -146,392 |
| 2011 | Q2 | 1,017,261 | +70,111 |
| 2011 | Q1 | 947,150 |